Spring Boot：无法配置

Question

SpringBoot似乎无法加载位于src/main/resources上的application.properties文件（也许不是）。我需要添加什么额外的配置来引导我的应用程序？

错误跟踪：

由：

org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException：无法确定数据库类型None的嵌入式数据库驱动程序类。如果您想要一个嵌入式数据库，请在类路径上放置一个受支持的数据库。如果要从特定配置文件加载数据库设置，则可能需要激活它（当前没有配置文件处于活动状态）。

membersapplication.java

@SpringBootApplication
public class MembersApplication {

public static void main(String[] args)
{
    SpringApplication.run(MembersApplication.class, args);
}
}

databaseConfig.java

@Configuration
@EnableTransactionManagement
public class DatabaseConfig {

  @Value("${db.driver}")
  private String DB_DRIVER;

  @Value("${db.password}")
  private String DB_PASSWORD;

  @Value("${db.url}")
  private String DB_URL;

  @Value("${db.username}")
  private String DB_USERNAME;

  @Value("${hibernate.dialect}")
  private String HIBERNATE_DIALECT;

  @Value("${hibernate.show_sql}")
  private String HIBERNATE_SHOW_SQL;

  @Value("${hibernate.hbm2ddl.auto}")
  private String HIBERNATE_HBM2DDL_AUTO;

  @Value("${entitymanager.packagesToScan}")
  private String ENTITYMANAGER_PACKAGES_TO_SCAN;

  @Bean
  public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName(DB_DRIVER);
    dataSource.setUrl(DB_URL);
    dataSource.setUsername(DB_USERNAME);
    dataSource.setPassword(DB_PASSWORD);
    return dataSource;
  }

  @Bean
  public LocalSessionFactoryBean sessionFactory() {
    LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
    sessionFactoryBean.setDataSource(dataSource());
    sessionFactoryBean.setPackagesToScan(ENTITYMANAGER_PACKAGES_TO_SCAN);
    Properties hibernateProperties = new Properties();
    hibernateProperties.put("hibernate.dialect", HIBERNATE_DIALECT);
    hibernateProperties.put("hibernate.show_sql", HIBERNATE_SHOW_SQL);
    hibernateProperties.put("hibernate.hbm2ddl.auto", HIBERNATE_HBM2DDL_AUTO);
    sessionFactoryBean.setHibernateProperties(hibernateProperties);

    return sessionFactoryBean;
  }

  @Bean
  public HibernateTransactionManager transactionManager() {
    HibernateTransactionManager transactionManager = 
        new HibernateTransactionManager();
    transactionManager.setSessionFactory(sessionFactory().getObject());
    return transactionManager;
  }

Answer 1

您的类路径上缺少DB JAR。如果您使用的是Maven/Gradle，只需将JDBC驱动程序依赖项包含到POM/Gradle文件中即可。